T10 WWN numbers

The iblock_0/lvm_test0/wwn configFS attributes are used to see world wide unique LUN information, be it real from the SCSI device, or emulated using a admin present value into iblock_0/lvm_test0/wwn/evp_unit_serial.

sg3_utils

Linux support for client side PRs using sg3_utils and RHEL cluster scripts. The fence_scsi_test was originally written for RHEL clusters, and is available on a number of other Linux distributions including SuSE, Debian, Ubuntu, etc.